The 17 pitch OFS4 grips well, almost no slip, no blow out in turns but some minor venting down wind where the OFX4 didn’t on the highest hole. The trade off with the 17 OFS prop is the added stern lift without the bow lift this boat likes to run efficient. If I trimmed out to get the bow up where it normally was on the OFX it would start to vent a little.

I have read that older Powertech props may have had quality control issues with pitch. The OFX19 is a 2009 from what I can tell on the Serial Number.

I would like an efficient cruise speed 3500-3600 rpms, with no venting while carrying a full load, and still be able to be around 6000 rpms WOT at or around 40 mph. Maybe this is to much to expect...

Questions:

1. Does it seem like the OFX4 19 is really a higher pitch, 20 or 21?
2. Should I try to find someone with a “good” OFX4 19 to try.
3. Should I try another prop like the Rev4?
4. Should I put a 4in setback Jackplate and run the OFX4 19 I have just higher to get the RPMs up and lower when downwind/waves?
5. Just buy an OFX4 17, lower the motor back down a hole, put the permatrim back on and call it a day?
6. Try finding an OFX5 18 and see if that is the best compromise?

Hope Ken and the group can guide me in the right direction.

Appreciate the comments and advise in advance.

PS. If there are any other Tideline 19 owners reading this would REALLY love to hear what your running and have to say.

One thing I notice is you were "stock" in the #2 hole. and that report says they were in #4.
I'd also be curious if they had a Ttop on the test boat. (the boat pictured is just a picture, Not necessarily the boat they tested)
Do you have a Ttop ?
This looks like the one tested. http://www.floridasportsman.com/2012...wer_catamaran/

Given your previous numbers, the OFS4 17 seems to be doing well.

But I'd have Rich at Leading Edge Propeller go over your OFX4R19 and see what he can do with it.
Yes, Powertech props vary, (still) but Rich can likely fix it.
His contact info. phone 941 720 0710 best to call or text between 2-6pm
email RichJunker87@gmail.com

When your running these test, how much is in the boat?
livewells full ? anchor and chain in the bow? Trolling motor, extra batteries? coolers and stuff? Ttop ?
Just curious, as I've seen it make a surprising difference on smaller cats. Calcutta cats see a big difference in economy and speed depending on load too.

Comment

Looking at the engine, in stock form, the engine bolts were mounted in the 2nd hole from the bottom .

Example Stock:
( )
( )
( )
(X)
( )

I could move 1 hole "up" and did. The engine is mounted as high on the transom as possible now.

( )
( )
( )
( )
(X)

hope this helps clarify.

Our boat has a bikini and all testing was done with it removed.

We have a trolling motor on the bow, 7lb anchor in the bow locker, 2ft chain, Dual trolling Batteries mounted in center console with the 2 engine batteries. 20gal live well at center stern empty for testing. This is almost as close to the Suzuki test as I could make it.